基于响应面方法的多支柱起落架着陆缓冲性能优化

Performance optimization of shock absorber for multi-strut landing gear based on RSM

基于起落架缓冲系统受力分析,在MSC.ADAM S平台上建立了某型飞机多支柱主起虚拟样机模型,在给定的投放质量和下沉速度下分析了该起落架的缓冲系统行程、轮胎垂直力和功量曲线。为降低飞机着陆载荷,选取对缓冲器性能敏感程度较大的参数为优化参数,包括空气腔初始容积、初始充气压力及主油孔面积,以着陆时轮胎最大垂直载荷为优化目标。通过基于正交设计的响应面方法,建立优化变量和优化目标间的数学关系,求解方法为模拟退火法。优化后,对新设计参数进行了虚拟试验验证,结果表明降低着陆总载荷8.3%,明显改善了起落架着陆缓冲性能。

A virtual prototype model of multi-strut landing gear was estabished with MSC.Adams software after the force analysis of its shock absorber system.The stoke of absorber,vertical load the of tyre and the energy was analyzed at given sink speed and drop mass.In order to decrease the landing load,the parameters sensitive to the dynamic performance of the absorber,such as initial air cavities cubage,initial pressure and orifice size,were choosed as optimization,target was the maximal vertical load of the tyre during loading.Based on the orthogonal design the mathematical relations between optimization parameters and optimization target were got by the use of response surface method.The simulation anneal method was used in this optimization problem.The virtual simulation result shows that the dynamic performance of updated shock absorber improved effectively,the total landing load decreased by 8.3% after optimization.